Beautiful paint job! I painted my stock rims and they look friggin bad as heck IMO, but I painted mine black to match the car...I like to blend in
You can also paint them chrome though if thats the look you want. I honestly wouldn't go for the flat silver look they have now.
Anyways as far as painting I just sanded the surface till it was even and smooth and rattle canned 1 coat primer 3 coats black then 2 coats of clear. They look amazing!